Electronic book



FIG. 1 is a front perspective view of an electronic book showing our new design in a fully opened position;

FIG. 2 is a rear view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof. 

The ornamental design for an electronic book, as shown and described. 